Look at your VIN plate or frame stamp. Example: ST125-XXXXXX . The first few digits indicate the model code. Match this with the model coverage listed in the catalogue.
Wait, maybe I missed something. Oh, also, if the user is replacing parts, they might need compatibility information. Like, not all parts from other models are interchangeable. So, stress the importance of model-specific parts. Also, mention the possibility of needing a service manual alongside the parts catalog for installation instructions. yamaha stx 125 parts catalogue pdf